Title :
A Two-Level Distributed Sub-Carrier Allocation Algorithm Based on Ant Colony Optimization in OFDMA Systems
Author :
Lin, Rui ; Niu, Kai ; Xu, Wenjun ; He, Zhiqiang
Author_Institution :
Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
In this paper, we develop a distributed sub-carrier allocation algorithm with a low complexity in OFDMA multi-cell system , which is decomposed into two sub-problems: inter-cell and intra-cell sub-carrier allocation. During inter-cell process, based on time-variant characteristics and performance differ-ences among cells of sub-carriers, each base station applies Ant Colony Optimization (ACO) to choose available sub-carriers dynamically, which contributes to reduce co-channel interference. According to pheromone associated with channel capacity, the probability of choosing sub-carrier with better capability is higher. Then during intra-cell process, each base station sufficiently uses multi-user diversity to satisfy all users´ QoS requirements and greatly increase system throughput. Simulation results show that this algorithm exhibits substantial gains over existing frequency reuse schemes.
Keywords :
cochannel interference; frequency division multiple access; optimisation; quality of service; OFDMA multi-cell system; QoS requirements; ant colony optimization; co-channel interference; distributed sub-carrier allocation algorithm; inter-cell sub-carrier allocation; intra-cell sub-carrier allocation; performance differences; time-variant characteristics; Ant colony optimization; Base stations; Bit error rate; Fading; Frequency diversity; Helium; OFDM; Resource management; Throughput; Wireless networks;
Conference_Titel :
Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-2518-1
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2010.5494103